I am down to two Highway Parolmen right now. I have owned well over a dozen. I used to buy reasonably priced used ones, clean them up, add r/r and w/o and sometimes target hammers and triggers and resell them for usually $75 to $100 over what I had in them.
The oldest is S 1139XX (July, 1954), a 4 incher that I traded a six incher for. The guy I got it from bought it new in Buffalo, NY, shot a box of .38's in it, cosmolined it, put it away and joined the army. He got it out of storage in 1984 and wanted something longer to hunt with. I traded him a 6 inch M-28-2 (N5465XX) that I had added the r/r and w/o to. Box and what came with it. Target hammer, Pachmayr grip adapter. Gotta letter it someday.
I have a six inch M-28-2 N 5297XX I bought in 1981. It was used but looked like new. I qualified with it but only carried it on duty a couple of times. It's been with my little brother for years until recently and probably has 10,000 miles of ATV riding on it. It needs a bath really badly! I hanged onto it because it shot so well.
The first one I owned, N 253837, I bought new in 1976 with the intention of making a .44 Special with it, which I did. I sold it when the Model 24-3's came out. I wish I hadnt and would buy it back if I found it.